Film Formed from a Blend of Biodegradable Aliphatic-Aromatic Copolyesters

a biodegradable, aromatic technology, applied in the direction of synthetic resin layered products, medical patches, textiles and paper, etc., can solve the problems of lack of the wide range of processing and physical properties often needed

Active Publication Date: 2009-06-18
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such attempts, however, are generally designed only for a specific application and lack the wide range of flexibility in processing and physical properties often needed for films having a large number of potential uses.

Method used

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  • Film Formed from a Blend of Biodegradable Aliphatic-Aromatic Copolyesters
  • Film Formed from a Blend of Biodegradable Aliphatic-Aromatic Copolyesters
  • Film Formed from a Blend of Biodegradable Aliphatic-Aromatic Copolyesters

Examples

Experimental program
Comparison scheme
Effect test

examples

[0072]The following test methods were employed in the examples.

Test Methods

Breathability:

[0073]The WVTR (water vapor transmission rate) value of was determined using the test procedure standardized by INDA (Association of the Nonwoven Fabrics Industry), number IST-70.4-99, entitled “STANDARD TEST METHOD FOR WATER VAPOR TRANSMISSION RATE THROUGH NONWOVEN AND PLASTIC FILM USING A GUARD FILM AND VAPOR PRESSURE SENSOR”, which is incorporated herein in its entirety by reference thereto for all purposes. The INDA test procedure is summarized as follows. A dry chamber is separated from a wet chamber of known temperature and humidity by a permanent guard film and the sample material to be tested. The purpose of the guard film is to define a definite air gap and to quiet or still the air in the air gap while the air gap is characterized. The dry chamber, guard film, and the wet chamber make up a diffusion cell in which the test film is sealed. The sample holder is known as the Permatran-W Mo...

examples 1-5

[0085]The ability to form a microporous film from an aliphatic-aromatic copolyester formed from a dimethyl isophthalate monomer was demonstrated. More specifically, the aliphatic-aromatic copolyester was obtained from Econeer, Inc. under the designation “Ecopol™ EBP 203.” Ecopol™ EBP 203 had two melting peaks of 106° C. and 112° C., and the respective enthalpies of melting were 6 and 9 J / mol.

[0086]Two types of inorganic fillers were also used, i.e., “2sst” CaCO3 (Omya, Inc. Alpharetta, Ga.), and Microtalc™ MP 3036 (Barretts Minerals, Inc. Dillon, Mont.). The mean particle size for 2sst CaCO3 was 2 microns. Microtalc™ MP 3036 had a median particle size is 3 microns and contained about 61% silicon dioxide and 31% magnesium oxide. Blends of the polymer and fillers were made using ZSK-30 extruder (Werner and Pfleiderer Corporation, Ramsey, N.J.), which is a co-rotating, twin screw extruder. The extruder diameter was 30 mm with the length of the screws up to 1328 mm. The extruder had 14 ...

examples 6-8

[0088]The ability to form a microporous film from a blend of a first aliphatic-aromatic copolyester formed from a terephthalic acid monomer and a second aliphatic-aromatic copolyester formed from a dimethyl isophthalate monomer was demonstrated. More specifically, the first copolyester was obtained from BASF under the designation “Ecoflex® F BX 7011” and the second copolyester was obtained from Econeer, Inc. under the designation “Ecopol™ EBP 203.”“2sst” CaCO3 (Omya, Inc. Alpharetta, Ga.) was employed as an inorganic filler. The melting peak of Ecoflex® F BX 7011 was 119° C. and its enthalpy of melting was 19.3 J / mol.

[0089]Blends of the polymer and filler were made using ZSK-30 extruder (Werner and Pfleiderer Corporation, Ramsey, N.J.) as described above. The Ecoflex® F BX 7011 and Ecopol™ EBP 203 resins were added to K-Tron feeder (K-Tron America, Pitman, N.J.) that vertically fed the resin into ZSK-30 extruder. Barrel #1 received the Ecopol™ EBP resin and the Ecoflex® F BX 7011 re...

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Abstract

A film that is formed from a biodegradable polymer blend of different aliphatic-aromatic copolyesters is provided. More specifically, the blend contains a first copolyester formed from a terephthalic acid monomer. The use of a terephthalic acid monomer results in a polymer chain containing 1,4-(para-) terephthalate units linked in a generally linear configuration (e.g., ˜180°). The blend also contains a second aliphatic-aromatic copolyester formed from a phthalic acid and/or isophthalic acid monomer. The use of such a monomer results in a polymer chain containing 1,2-(ortho-) and/or 1,3-(meta-) linked units. The inclusion of 1,2-(ortho-) and/or 1,3-(meta-) linked units into the polymer backbone of the second copolyester introduces an angle or “kink” (e.g., ˜120° kink for a 1,3-linkage) into the otherwise linear polymer chain. The “kinks” in the second copolyester backbone reduce its melting point and degree of crystallinity, which have an influence on its physical properties (e.g., toughness, tensile strength, and crystallization rate). Thus, the physical properties of the second copolyester may differ substantially from those of the first copolyester. In this regard, the “kinked” second copolyester can provide flexibility for forming films with a wide range of properties that is superior to that which may be achieved using either of copolyesters alone.

Description

BACKGROUND OF THE INVENTION[0001]Disposable absorbent products (e.g., diapers, feminine hygiene products, incontinence products, etc.) are subjected to one or more liquid insults, such as of water, urine, menses, or blood, during use. Many commercially available diapers allow water vapor to pass through the diaper and into the environment to lessen the amount of moisture held against the skin and reduce the chance of skin irritation and rash due to skin overhydration. To allow the passage of vapor through the diaper and into the environment while holding liquid, a “breathable” outer cover is often employed that is formed from a nonwoven web laminated to a film. The film contains a filler (e.g., calcium carbonate) that causes a series of micropores to develop in the film when stretched. The micropores form what is often referred to as “tortuous pathways” through the film. Liquid contacting one side of the film does not have a direct passage through the film. Instead, a network of mic...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F13/15B32B3/26D04H13/00B29C55/00C08L33/02
CPCB29C55/06Y10T428/258B29C55/12B29K2067/046B29K2105/0088B29K2467/043B29K2995/006B32B27/12B32B27/36C08J5/18C08J2367/02C08L67/02B29C55/08B32B2556/00B32B5/022B32B7/12B32B2262/04B32B2307/54B32B2307/558B32B2307/7163B32B2307/724B32B2307/7265B32B2437/00B32B2555/00B32B2555/02C08L2666/18B32B2367/00C08G63/12C08G63/123C08G63/127C08G63/16C08G63/18C08G63/181C08G63/183C08L67/03Y10T428/249978Y10T428/31786Y10T442/674Y10T442/675Y10T442/678
Inventor SHI, BOWANG, JAMES H.
Owner KIMBERLY-CLARK WORLDWIDE INC
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